Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f3e86dde7012c4…

MALICIOUS

PDF

86.2 KB Created: 2021-06-28 06:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3842eea124e6a261ead847a42329486f SHA-1: 51cf2a34a7718a57353c736e6cdd12f59573f3b1 SHA-256: 91f3e86dde7012c42b14d4dfa90172abc26c4180cdbd0dcf159dd31b57f68ff9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous external URLs, some of which are hosted on compromised CMS upload storage. The presence of a 'download button' lure suggests an attempt to trick the user into downloading a payload. While no scripts were explicitly extracted, the PDF structure and link farm indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://brezov-gaj.si/uporabnik/file/49741501850.pdf
    • http://provia-events.de/pics/fotos/1/file/87957335593.pdf
    • http://sochisushi.nl/survey/userfiles/files/xirinenofo.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/eafcb1033734cefef01d0655d6202908/numidesi.pdf
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/cd487011e7f900f1d572e06138ece8c5/nujup.pdf
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608719d7dd43c---ruguruwubeniv.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/63f8df4fcef521f8940f9c153ad6fa8e/wogesafakazelubures.pdf
    • https://andana.us/files/files/dujofujawovutu.pdf
    • http://nkland.org/userfiles/files/70718295043.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/mmtjrmkg96umk3t2utu55noo2b/pubowozez.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16083214b22588---45772675888.pdf
    • https://alzubidi.com/userfiles/files/74371480583.pdf
    • https://gamedunyasi.com/calisma2/files/uploads/70590397254.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/0r60n8gnrjf8ajjrtuklnj52d7/kukaw.pdf
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/34747849080.pdf
    • https://aprilboya.com/userfiles/file/19504562487.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a15eb1655---towepolukebu.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/defcd93291647c79d72f67064d588d50/xarumutafetonofitunu.pdf
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160924d9c689a7---fikarobogabenolakuxesuk.pdf
    • http://temple.mo/userfiles/file/jopitok.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa869a81b5---79744943649.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c859f9ea7b---19901200857.pdf
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/30312852184.pdf
    • http://fitviewer.biz/files/file/90016467636.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=sultan+tamil+full+movie+download+in+moviesda
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE95 16792 bytes
font_01_sfnt_off000106a7.bin
daff538e7ea1404b902d6100a2f5623ed3d0c8c6e1b7e19438cbc7dcbd7879a5
pdf-font-stream PDF embedded font (sfnt) at offset 0x106A7 16940 bytes
font_02_sfnt_off000132cb.bin
8ac17cdd1e90edbf734ad1e6ca1ffd87ab0a207ab33c9af603673346d3bba9de
pdf-font-stream PDF embedded font (sfnt) at offset 0x132CB 10740 bytes